feat: get rid of gc and cyclic thunk

src/ty/internal/list.rs

@@ -1,9 +1,10 @@
-use hashbrown::HashSet;
-use gc_arena::{Collect, Gc, Mutation};
+use std::rc::Weak;
 
+use hashbrown::HashSet;
+
+use crate::env::VmEnv;
 use crate::ty::public as p;
 use crate::vm::VM;
-use crate::env::VmEnv;
 
 use super::Value;
 
@@ -12,17 +13,15 @@ pub struct List<'gc> {
     data: Vec<Value<'gc>>,
 }
 
-unsafe impl<'gc> Collect<'gc> for List<'gc> {
-    fn trace<T: gc_arena::collect::Trace<'gc>>(&self, cc: &mut T) {
-        self.data.trace(cc);
+impl<'gc> Default for List<'gc> {
+    fn default() -> Self {
+        Self::new()
     }
 }
 
 impl<'gc> List<'gc> {
     pub fn new() -> Self {
-        List {
-            data: Vec::new(),
-        }
+        List { data: Vec::new() }
     }
 
     pub fn with_capacity(cap: usize) -> Self {
@@ -41,10 +40,10 @@ impl<'gc> List<'gc> {
         }
     }
 
-    pub fn capture(&mut self, env: Gc<'gc, VmEnv<'gc>>, mc: &Mutation<'gc>) {
+    pub fn capture(&mut self, env: &Weak<VmEnv<'gc>>) {
         self.data.iter().for_each(|v| {
             if let Value::Thunk(ref thunk) = v.clone() {
-                thunk.capture_env(env, mc);
+                thunk.capture_env_weak(env.clone());
             }
         })
     }